Initial schema setup file not being ran

[Syntaf]

Excuse my lack of knowledge with docker, but I can't seem to figure out why my initial schema isn't being ran. My docker-compose looks like:

version: '2'

services:
    boilerplatebackend:
        ...

        depends_on:
            - postgres

        environment:
            DATABASE_URL: ...

        ports:
          - "8080:8080"
    postgres:
        image: postgres
        environment:
            POSTGRES_USER: smashggextadmin
            POSTGRES_DB: smashggext
        build: ./backend/database

then inside ./backend/database I have

FROM postgres
COPY ./initial_schema.sql /docker-entrypoint-initdb.d/

where initial_schema.sql =
CREATE TABLE links(channelid INT NOT NULL PRIMARY KEY, link VARCHAR(255) NOT NULL)

Everything seems to get up and running, but the links table is never created. Am I doing something blatantly wrong here? Thanks a bunch for any help!

[yosifkit]

This might help explain how the volumes get saved when using compose: #203 (comment). The short answer is that the initdb.d files are only run when the database files have not been created.

[Syntaf]

Thanks @yosifkit , I found that removing the existing volume and building from scratch worked.